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Answers

The complement of an event is the ways the given event CANNOT happen. So, if tossing a "3" on a single toss of a number cube is can happen ONE way, then the complement of tossing a "3" on a single toss of a number cube is any of the five tosses which are not 3: 1, 2, 4, 5, and 6.

P( 3 toss) = 1/6P (NOT tossing 3) = 5/6

Observe that the probability of an event + the probability of the complement of an even is equal to 1.